[1]} with \(P\)  the spin period and \(c\)  the speed of light. In turn, the observed pulse width is related to \(\rho \)  via the geometry and can be expressed [2]} as
\({\rm cos}\rho = {\rm cos}\alpha \,\, {\rm cos}\zeta \,\, +\,\, {\rm sin}\alpha \,\, {\rm sin}\zeta \,\, {\rm cos}(W_{10}/2)\) 
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